pg_range.c

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/*-------------------------------------------------------------------------
 *
 * pg_range.c
 *    routines to support manipulation of the pg_range relation
 *
 * Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 *
 * IDENTIFICATION
 *    src/backend/catalog/pg_range.c
 *
 *-------------------------------------------------------------------------
 */
#include "postgres.h"
 
#include "access/genam.h"
#include "access/htup_details.h"
#include "access/table.h"
#include "catalog/dependency.h"
#include "catalog/indexing.h"
#include "catalog/pg_collation.h"
#include "catalog/pg_opclass.h"
#include "catalog/pg_proc.h"
#include "catalog/pg_range.h"
#include "catalog/pg_type.h"
#include "utils/fmgroids.h"
#include "utils/rel.h"
 
 
/*
 * RangeCreate
 *      Create an entry in pg_range.
 */
void
RangeCreate(Oid rangeTypeOid, Oid rangeSubType, Oid rangeCollation,
            Oid rangeSubOpclass, RegProcedure rangeCanonical,
            RegProcedure rangeSubDiff, Oid multirangeTypeOid)
{
    Relation    pg_range;
    Datum       values[Natts_pg_range];
    bool        nulls[Natts_pg_range];
    HeapTuple   tup;
    ObjectAddress myself;
    ObjectAddress referenced;
    ObjectAddress referencing;
    ObjectAddresses *addrs;
 
    pg_range = table_open(RangeRelationId, RowExclusiveLock);
 
    memset(nulls, 0, sizeof(nulls));
 
    values[Anum_pg_range_rngtypid - 1] = ObjectIdGetDatum(rangeTypeOid);
    values[Anum_pg_range_rngsubtype - 1] = ObjectIdGetDatum(rangeSubType);
    values[Anum_pg_range_rngcollation - 1] = ObjectIdGetDatum(rangeCollation);
    values[Anum_pg_range_rngsubopc - 1] = ObjectIdGetDatum(rangeSubOpclass);
    values[Anum_pg_range_rngcanonical - 1] = ObjectIdGetDatum(rangeCanonical);
    values[Anum_pg_range_rngsubdiff - 1] = ObjectIdGetDatum(rangeSubDiff);
    values[Anum_pg_range_rngmultitypid - 1] = ObjectIdGetDatum(multirangeTypeOid);
 
    tup = heap_form_tuple(RelationGetDescr(pg_range), values, nulls);
 
    CatalogTupleInsert(pg_range, tup);
    heap_freetuple(tup);
 
    /* record type's dependencies on range-related items */
    addrs = new_object_addresses();
 
    ObjectAddressSet(myself, TypeRelationId, rangeTypeOid);
 
    ObjectAddressSet(referenced, TypeRelationId, rangeSubType);
    add_exact_object_address(&referenced, addrs);
 
    ObjectAddressSet(referenced, OperatorClassRelationId, rangeSubOpclass);
    add_exact_object_address(&referenced, addrs);
 
    if (OidIsValid(rangeCollation))
    {
        ObjectAddressSet(referenced, CollationRelationId, rangeCollation);
        add_exact_object_address(&referenced, addrs);
    }
 
    if (OidIsValid(rangeCanonical))
    {
        ObjectAddressSet(referenced, ProcedureRelationId, rangeCanonical);
        add_exact_object_address(&referenced, addrs);
    }
 
    if (OidIsValid(rangeSubDiff))
    {
        ObjectAddressSet(referenced, ProcedureRelationId, rangeSubDiff);
        add_exact_object_address(&referenced, addrs);
    }
 
    record_object_address_dependencies(&myself, addrs, DEPENDENCY_NORMAL);
    free_object_addresses(addrs);
 
    /* record multirange type's dependency on the range type */
    referencing.classId = TypeRelationId;
    referencing.objectId = multirangeTypeOid;
    referencing.objectSubId = 0;
    recordDependencyOn(&referencing, &myself, DEPENDENCY_INTERNAL);
 
    table_close(pg_range, RowExclusiveLock);
}
 
 
/*
 * RangeDelete
 *      Remove the pg_range entry for the specified type.
 */
void
RangeDelete(Oid rangeTypeOid)
{
    Relation    pg_range;
    ScanKeyData key[1];
    SysScanDesc scan;
    HeapTuple   tup;
 
    pg_range = table_open(RangeRelationId, RowExclusiveLock);
 
    ScanKeyInit(&key[0],
                Anum_pg_range_rngtypid,
                BTEqualStrategyNumber, F_OIDEQ,
                ObjectIdGetDatum(rangeTypeOid));
 
    scan = systable_beginscan(pg_range, RangeTypidIndexId, true,
                              NULL, 1, key);
 
    while (HeapTupleIsValid(tup = systable_getnext(scan)))
    {
        CatalogTupleDelete(pg_range, &tup->t_self);
    }
 
    systable_endscan(scan);
 
    table_close(pg_range, RowExclusiveLock);
}